Gulu la Free electron Laser la Chinese Academy of Sciences lapita patsogolo pa kafukufuku wa ma laser aulere a electron omwe ali ndi mgwirizano wokwanira. Kutengera ndi Shanghai Soft X-ray Free Electron Laser Facility, njira yatsopano ya echo harmonic cascade free electron laser yomwe idaperekedwa ndi China yatsimikiziridwa bwino, ndipo ma radiation ofewa a X-ray okhala ndi magwiridwe antchito abwino apezeka. Posachedwapa, zotsatira zake zidasindikizidwa mu Optica pansi pa mutu wakuti Coherent ndi ultra-short soft X-ray pulses kuchokera ku echo-enabled harmonic cascade free electron lasers.
Laser ya ma electron yopanda ma X-ray ndi imodzi mwa magwero apamwamba kwambiri padziko lonse lapansi. Pakadali pano, ma laser ambiri apadziko lonse lapansi opanda ma X-ray amachokera ku njira yodzipangira yokha (SASE), SASE ili ndi kuwala kwakukulu kwambiri komanso kutalika kwa pulse yafupi kwambiri komanso magwiridwe antchito ena abwino kwambiri, koma kugwedezeka kwa SASE ndi phokoso, mgwirizano ndi kukhazikika kwa pulse yake ya radiation sikokwera, si "laser" ya X-ray. Chimodzi mwa malangizo ofunikira kwambiri pakukula kwa laser yaulere yapadziko lonse lapansi ndikupanga ma radiation a X-ray ogwirizana bwino ndi mtundu wa laser wamba, ndipo njira yofunika ndikugwiritsa ntchito njira yogwirira ntchito ya laser yakunja yopanda ma electron. Ma radiation a laser yakunja yopanda ma electron amalandira mawonekedwe a laser yambewu, ndipo ali ndi mawonekedwe abwino kwambiri monga mgwirizano wonse, kuwongolera gawo komanso kulumikizana kolondola ndi laser yakunja. Komabe, chifukwa cha malire a kutalika kwa wavelength ndi kutalika kwa pulse ya laser yambewu, kuphimba kwa wavelength yaifupi komanso kusintha kwa kutalika kwa pulse ya laser yakunja yopanda ma electron ndi kochepa. Pofuna kukulitsa kufalikira kwa mafunde afupiafupi a laser yakunja yopanda mbewu, njira zatsopano zogwiritsira ntchito laser yaulere monga kupanga echo harmonic zikupangidwa mwamphamvu padziko lonse lapansi m'zaka zaposachedwa.
Laser yakunja yopanda ma electron ndi imodzi mwa njira zazikulu zopangira laser yakunja yopanda ma electron ku China. Pakadali pano, zipangizo zonse zinayi zakunja zopanda ma electron ku China zagwiritsa ntchito njira yogwiritsira ntchito mbewu. Kutengera ndi Shanghai Deep Ultraviolet Free electron Laser Facility ndi Shanghai Soft X-ray Free Electron Laser Facility, asayansi apeza motsatizana njira yoyamba yapadziko lonse lapansi yopangira kuwala kwa echo type free electron laser komanso yoyamba yopangira kuwala kwa extreme ultraviolet echo type free electron laser saturation amplification. Pofuna kupititsa patsogolo kupititsa patsogolo kwa external seed free electron laser kufupi kwa nthawi, gulu lofufuza linapereka njira yatsopano yopangira fully coherent free electron laser yokhala ndi echo harmonic cascade, yomwe idagwiritsidwa ntchito ndi chipangizo cha Shanghai Soft X-ray Free electron Laser ngati njira yoyambira, ndipo idamaliza njira yonse kuyambira kutsimikizira mfundo mpaka kukulitsa kuwala mu gulu lofewa la X-ray. Zotsatira za kafukufuku zikusonyeza kuti poyerekeza ndi njira yachikhalidwe yogwiritsira ntchito mtundu wa mbewu zakunja, njira iyi ili ndi mawonekedwe abwino kwambiri a spectral, kudzera mu kuvomereza kwa ofufuza za chitukuko chodziyimira pawokha cha ukadaulo wozindikira ma pulse wa X-ray (https://doi.org/10.1016/j.fmre.2022.01.027), Kugwira ntchito kwabwino kwa njira yatsopanoyi pakulamulira kutalika kwa ma pulse ndi kupanga ma pulse othamanga kwambiri kwatsimikiziridwanso. Zotsatira za kafukufuku wofunikira zimapereka njira yotheka yaukadaulo yopangira ma laser a ma electron aulere ogwirizana bwino mu subnanometer band, ndipo ipereka chida choyenera chofufuzira m'magawo a X-ray nonlinear optics ndi ultrafast physical chemistry.
Laser ya echo harmonic cascade free electron ili ndi magwiridwe antchito abwino kwambiri: chithunzi chakumanzere ndi njira yachikhalidwe ya cascade, ndipo chithunzi chakumanja ndi njira ya echo harmonic cascade.
Kusintha kwa kutalika kwa kugunda kwa X-ray ndi kupanga kugunda kwa ultrafast kumatha kuchitika ndi echo harmonic cascade
Nthawi yotumizira: Okutobala-08-2023